$ sudo apt-get update
$ sudo apt-get install apache2-threaded-dev 

apache2-threaded-dev is installed in your system.

Make ensure the apache2-threaded-dev package were installed using the commands given below,

$ sudo dpkg-query -l | grep apache2-threaded-dev *

You will get with apache2-threaded-dev package name, version, architecture and description in a table

apache2-threaded-dev package basic information: